lkml.org 
[lkml]   [2020]   [Sep]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/3] ASoC: tlv320aic32x4: Enable fast charge
On 15/09/2020 16:14:01+0200, Miquel Raynal wrote:
> Mark Brown <broonie@kernel.org> wrote on Tue, 15 Sep 2020 15:10:25
> +0100:
>
> > On Tue, Sep 15, 2020 at 03:02:07PM +0200, Alexandre Belloni wrote:
> > > On 15/09/2020 12:50:34+0100, Mark Brown wrote:
> > > > On Tue, Sep 15, 2020 at 10:26:02AM +0200, Alexandre Belloni wrote:
> > > > > On 11/09/2020 19:31:40+0200, Miquel Raynal wrote:
> >
> > > > > > + /*
> > > > > > + * Enable the fast charging feature and ensure the needed 40ms ellapsed
> > > > > > + * before using the analog circuits.
> > > > > > + */
> > > > > > + snd_soc_component_write(component, AIC32X4_REFPOWERUP,
> > > > > > + AIC32X4_REFPOWERUP_40MS);
> > > > > > + msleep(40);
> > > > > > +
> >
> > > > > Maybe the actual REFPOWERUP value could be exposed as a control so
> > > > > userspace has a way to set the policy?
> >
> > > > We very rarely do this, there's not usially anything
> >
> > > Could you suggest something then? This mainly changes the power
> > > codec power consumption. I guess people will want to trade latency
> > > for less consumption.
> >
> > Is it increasing steady state power consumption or is it just drawing
> > more power during the ramp (ie, peak current consumption is bigger)?
> > Usually this is trading off clean ramps for fast ramps rather than
> > affecting steady state. If it's affecting steady state a control seems
> > sensible.
>
> Indeed, it is just affecting the ramp (peak current is bigger).
>

However, forcing powerup at probe time versus at play time means that
you consume power even when not playing audio.

--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

\
 
 \ /
  Last update: 2020-09-16 02:07    [W:0.060 / U:0.088 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site